iOS 根据字符串数目，自定义Label等控件的高度

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface NSString (Height)

+ (CGSize)getRect:(NSString *)textStr andWidth:(CGSize)size andFont:(UIFont *)font;

@end

#import "NSString+Height.h"

@implementation NSString (Height)

+ (CGSize)getRect:(NSString *)textStr andWidth:(CGSize)size andFont:(UIFont *)font
{

CGRect rect = [textStr boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font} context:nil];

return rect.size;

}

@end

CGSize size = [NSString getRect:str andWidth:CGSizeMake(IOS_SCREEN.size.width/2 - 10, CGFLOAT_MAX) andFont:[UIFont systemFontOfSize:14]];

其中：

str 是将要计算的字符串，

IOS_SCREEN.size.width/2 - 10 是宽度，

[UIFont systemFontOfSize:14]是设置字号

这些需要自己根据情况写；